Closes#42522
## Changes
When `labels:` appears in a no-team/unassigned GitOps file, log a
warning and skip label parsing. This matches the existing pattern used
by `agent_options` and `reports` in no-team files.
A warning (not an error) is used intentionally to avoid breaking
existing customer GitOps pipelines that may already have `labels:` in
their no-team file.
**After fix:**
```
[!] 'labels' is not supported in unassigned.yml. This key will be ignored.
```
## Testing
### Manual testing
Built `fleetctl` from the fixed branch against a local Fleet server
(premium license).
| Scenario | Result |
|---|---|
| `unassigned.yml` dry-run | Warning printed, succeeds |
| `unassigned.yml` real run | Warning printed, succeeds |
| `no-team.yml` dry-run | Warning printed, succeeds |
| `no-team.yml` real run | Warning printed, succeeds |
| `unassigned.yml` without labels | No warning, succeeds (no regression)
|
### Unit tests
- **`TestLabelsIgnoredInNoTeamFile`**: Sub-tests for both `no-team.yml`
and `unassigned.yml` assert: (1) no error, (2) `LabelsPresent` is true,
(3) no labels parsed, (4) warning logged.
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